SECTION G GRAVITY VENTS - Thaler Metal · CALCULATING THE NUMBER OF GRAVITY AIR VENTS 144 Square...

GRAVITY VENTSSECTION G

A-0

ROOF SPECIALTIESGRAVITY VENTS

CANADA: 1.800.387.7217 U.S.: 1.800.576.1200 WEB: www.thalermetal.com EMAIL: [email protected]

Please be advised Thaler products may undergo improvements from time to time and are subject to change without notice.

Thaler Or Equal

GAV-1A/-GAV-1C/-GAV-1SS Gravity Air Vent (Small Size Vents)

GAV-2A/-GAV-2C/-GAV-2SS Gravity Air Vent (Largel Size Vents)

GAV-3A/-GAV-3C/-GAV-3SS Gravity Air Vent (Small Size Vents) Sloped Roofs

GAV-4A/-GAV-4C/-GAV-4SS Gravity Air Vent (Large Size Vents) Sloped Roofs

Gravity Vent Specification

H-0

H-1

H-2

H-3, H-3A

H-4, H-4A

H-5, H-6, H-7

TABLE OF CONTENTS



THALER OR EQUALWHAT IT TAKES TO BE

When specifications read Thaler or Equal, it is the responsibility of specifiers and building owners to determine what it means to be “Or Equal”. The following data has been presented to quickly help assess the comparative merits of “competitive” products. Thaler Gravity Vent products have a number of Value Added features that should be considered when trying to equate the “Or Equal”.

Treated deck flange; can be PVC coated for proper weld of PVC membrane, contact cement coated for EPDM, or bituminous painted for proper adhesion of BUR or ModBit membrane.

Material options and thicknesses; available in .064" (1.6 mm) mill finish 1100-0T Alloy aluminum, .032" (0.831 mm) 24 oz. copper, or .031 (0.79 mm) 22 ga. Type 304 stainless steel.

20 year Warranty; guaranteed against leaks and defects in materials and/or manufacture when installed in accordance with Thaler "Installation Instructions".

Specially shaped vent top; hood configuration facilitates draining of any condensation via the perimeter vent holes. Note: condensed or leaking water drops can pose a threat to built-up membranes, or to ceilings.

Removable conical hood; permits inspection of vented spaces for determining plenum condition.

Venting area calculation provided; to control condensation in winter and limit heat build-up during summer, Thaler have provided guidance with regard to the amount and location of vents thereby enhancing building durability.

Insect screen protection; Thaler vents employ screens with optimum mesh spacing to eliminate blocking by dust accumulation, which reduces air intake.

Protects against bitumen leakage; T-8 bitumen protection cup accessory (optional) completely eliminates problems associated with bitumen drippage, a common occurrence with many other types of vent products.

Virtually Maintenance-free; GAV models do not require any maintenance, however the vents have removable hood for checking vent space condition. Written "Installation Instructions"; provided with every Thaler product.

H-0

CHECK THECOMPETITION

THALER VALUEADDED FEATURES

ROOF SPECIALTIESGRAVITY AIR VENTS

CALCULATING THE NUMBER OF GRAVITY AIR VENTS

144 Square inches (930 cm2) of free venting area is required to vent 300 square feet of roof area (1/300). A minimum of two vents are required to vent any individual roof area. Venting efficiency is increased in direct proportion to the number of vents used.

For example: Four vents each with 36 square inches (232 cm ²)of free venting area on a 300 square foot (28 m ²)roof is preferable to using two vents, each with 72 square inches (464 cm ²)of free venting area. Increasing the number of vents, while maintain the required total amount of free venting area by decreasing the size of the individual vents allows air to drawn from the corners of the roof, thereby increasing overall venting efficiency, and avoiding condensation formation.

REMOVABLE CONICAL HOOD (FOR CLEANING) FITTED WITH THREE SUPPORT BRACKETS.0.064" (1.6 mm) ALUMINUM,24 oz. 0.032" (0.831) COPPER OR22 ga. 0.031" (0.79 mm) STAINLESS STEEL.

STAINLESS STEEL SCREW


SLEEVE WITH INTEGRAL DECK FLANGE 0.064" (1.6 mm) ALUMINUM, 24 oz. 0.032" (0.831 mm) COPPER OR22 ga. 0.31" (0.79 mm) STAINLESS STEEL.

STAINLESS STEEL WOOD SCREW4.5" (114 mm)3" ( 76 mm)

12" (

305

mm

)

INSECT SCREEN

3" (75 mm)

4" (1

02 m

m)

"A"

EMBED DECK FLANGE IN LAYER OF PLASTIC CEMENT

T-8 BITUMEN PROTECTION (OPTIONAL)

3 PLY FELT FLASHING OVER FLANGEAND 4" (102 mm), 6" (152 mm), AND 8" (203 mm) ONTO ROOF

WHEN ORDERING, STATE INSIDE DIAMETER (ID) OF VENT PIPE

AVAILABLE DIAMETERS "A"

3" (75 mm) 4" (102 mm) 5" (127 mm) 6" (152 mm) 7" (178 mm) 8" (203 mm) 9" (229 mm)10" (254 mm)

ROOF SPECIALTIESGAV-1A/-GAV-1C/GAV-1SSGRAVITY AIR VENTS (Small Size Vents)

DESCRIPTION:Thaler GAV-1 Gravity Air Vents consist of a metal sleeve with integral deck flange, removable conical hood fitted with a three support brackets, and insect screen. Available in aluminum (GAV-1A), copper (GAV-1C), or stainless steel (GAV-1SS).

DIAMETER:From 3" (76 mm) and 10" (254 mm).

NBC (NATIONAL BUILDING CODE) REQUIREMENT:For "Low Slope Roofs" where insulation is placed below the roof sheathing in roofs having a slope of less than 1 in 6, or in roofs that are constructed with roof joists, the unobstructed vent area shall not be less than 1/150 of the insulated ceiling area. Vents shall be uniformly distributed to ventilate each roof space.

SPACING: For any given roof, Thaler recommends a minimum 3" (76 mm) vent be located at each corner of the roof and a minimum of one vent in the middle of the roof. Venting efficiency is directly proportional to the number of vents employed e.g. 4 vents, each with 36 sq. in. (26 cm²) on a 300 sq.ft. (28 m²) roof is preferable to using 2 vents, each with a 72 sq. in. (54 cm2) of free venting area. Increasing the number of vents allows air to be drawn from the corners of the roof area thereby increasing overall venting efficiency while preventing the formation of condensation. Note: A minimum of two vents is required to vent any individual roof area.

OPTIONS:T-8 bitumen protection.

RECOMMENDED USE:Suitable for all flat/low slope roofs for venting of plenum spaces. Primarily designed for built up roofing (BUR) and modified bitumen roofing, or single ply roofs providing the deck flange has been treated for proper weld with the single ply. e.g. PVC coated deck flange for PVC membrane or contact cement coated deck flange for EPDM membrane. Consult Thaler representative for other single plys. See Thaler GAV-2 Gravity Air Vents for larger capacity vents.

WARRANTY:20 year warranty against defects in materials and/or manufacture when installed in accordance with Thaler "Installation Instructions". Copy of Warranty Certificate available upon request.

MAINTENANCE:No maintenance required (maintenance free).

SPECIFICATION (SHORT FORM):Gravity air vents: Thaler [GAV-1A] [GAV-1C][GAV-1SS] standard 12" (305 mm) high, [3" (76 mm)][4" (102 mm)] diameter gravity air vent consisting of [.064" (1.6 mm) mill finish 1100-0T alloy aluminum] [.032 (0.831 mm) 24 oz. copper] [.031" (0.79 mm) 22 ga. Type 304 stainless steel] with integral deck flange, removable conical hood fitted with three support brackets, and insect screen. [T-8 bitumen protection sleeve] [bituminous painted deck flange][PVC coated deck flange][plain deck flange]; manufactured by Thaler Metal Industries, 1-800-387-7217 (Mississauga, Ontario, Canada) or 1-800-576-1200 (New Braunfels, TX), installed as per manufacturer's written instructions. Provide 20 year warranty against defects in materials and/or manufacture.

INSTALLATION:"Installation Instructions" are provided with every Thaler product. Essentially, Thaler Gravity Air Vents are installed at recommended locations by first installing the roof membrane, then screwing the deck flange through to a wood blocking (by others) located under the membrane, and as follows:

BUR: Cut roof membrane back 1" (25 mm) from hole in deck before installing vent and fill space with plastic cement to prevent bitumen drippage at elevated roof temperatures. Set vent deck flange in layer of plastic cement and flash in with 3 overlapping layers of felt flashing.

ModBit: Cut roof membrane back 1" (25 mm) from hole in deck before installing vent and fill space with plastic cement to prevent bitumen drippage at elevated roof temperatures. Torch membrane until bitumen is fluid and set vent deck flange into fluid. Flash in flange with two overlapping layers of ModBit and seal with asphalt sealer.

Single Ply: Set vent deck flange in layer of membrane adhesive and extend single ply up vent sleeve to highest elevation possible and clamp membrane to sleeve. Note: for PVC membrane, specify PVC coated deck flange by adding suffix P to end of model number e.g. GAV-1A-P; weld roofing to deck flange using PVC torch. Note: for EPDM, coat deck flange on site with contact cement before torching membrane to deck flange.

Precautions: If coating deck flange with a bituminous paint on site, allow 24 hours for drying before applying roof membrane.

Ordering and Availability: Specify flashing material required by adding appropriate suffix to model number e.g. RV-2A, for aluminum, etc. Available throughout North America. Contact Thaler for list of distributors and current cost information. Most products are readily available from stock.

GAV-1A, GAV-1C, GAV-1SS GRAVITY AIR VENTS (Small Size Vents)PATENTED



A B C D(305mm) 12"DIA.

(356mm)14"DIA.

(406mm) 16"DIA.

(457mm)18"DIA.

(508mm) 20"DIA.

(508 mm)20"

(559 mm)

(609 mm)24"

(660 mm)26"

(762 mm)30"

22"(165 mm)6"-1/2"

(178 mm)7"

(191mm)7-1/2"

(203 mm)8"

(222 mm)

113.098 SQ.INCHES

153.938 SQ.INCHES

209.96 SQ.INCHES

254.470 SQ.INCHES

Area Sq. Inches

(467 mm)18"

(356 mm)14"

314.160 SQ.INCHES

14"(356 mm)

15"(381mm)

(356 mm)16"

MOISTURE STOPPER


144 Square inches (930 cm ²)of free venting area is required to vent 300 square feet of roof area (1/300). A minimum of two vents are required to vent any individual roof area. Venting efficiency is increased in direct proportion to the number of vents used.

For example: Four vents each with 36 square inches (232 cm ²) of free venting area on a 300 square foot (28 m ²) roof is preferable to using two vents, each with 72 square inches (464 cm ²) of free venting area. Increasing the number of vents, while maintaining the required total amount of free venting area by decreasing the size of the individual vents allows air to be drawn from the corners of the roof, thereby increasing overall venting efficiency, and avoiding condensation formation.

REMOVABLE CONICAL HOOD (FOR CLEANING) FITTED WITH THREE SUPPORT BRACKETS.0.064" (1.6 mm) ALUMINUM,24 oz. (0.831 mm) COPPER OR22 ga. 0.031" (0.79 mm) STAINLESS STEEL.



SLEEVE WITH INTEGRAL DECK FLANGE 0.064" (1.6 mm) ALUMINUM,24 oz. 0.032" (0.831 mm) COPPER OR 22 ga. 0.031" (0.79 mm) STAINLESS STEEL.

STAINLESS STEEL WOOD SCREW ON 6" (152 mm) APPROX. DISTANCE.

INSECT SCREEN

EMBED DECK FLANGE IN LAYER OF PLASTIC CEMENT

T-8 BITUMEN PROTECTION (OPTIONAL)

3 PLY FELT FLASHING OVER FLANGEAND 4" (102 mm), 6" (152 mm), AND 8" (203 mm) ONTO ROOF

4" (102 mm)

3" (75 mm)

A

B

C

D

STEEL DECKCONCRETE DECK

8-3/4"

730 (cm²)

993 (cm²)

1297 (cm²)

1641 (cm²)

2026 (cm²)

ROOF SPECIALTIESGAV-2A/-GAV-2C/GAV-2SSGRAVITY AIR VENTS (Large Size Vents)

DESCRIPTION:Thaler GAV-2 Gravity Air Vents consist of a metal sleeve with integral deck flange, removable conical hood fitted with a three support brackets, and insect screen. Available in aluminum (GAV-2A), copper (GAV-2C), or stainless steel (GAV-2SS).

DIAMETER:From 12" (305 mm) to 20" (508 mm).

NBC (NATIONAL BUILDING CODE) REQUIREMENT:For "Low Slope Roofs" where insulation is placed below the roof sheathing in roofs having a slope of less than 1 in 6, or in roofs that are constructed with roof joists, the unobstructed vent area shall not be less than 1/150 of the insulated ceiling area. Vents shall be uniformly distributed to ventilate each roof space.Spacing: For any given roof, Thaler recommends a minimum 3" (76 mm) vent be located at each corner of the roof and a minimum of one vent in the middle of the roof. Venting efficiency is directly proportional to the number of vents employed e.g. 4 vents, each with 36 sq. in. (26 cm2) on a 300 sq.ft. (28 m²) roof is preferable to using 2 vents, each with a 72 sq. in. (54 cm²) of free venting area. Increasing the number of vents allows air to be drawn from the corners of the roof area thereby increasing overall venting efficiency while preventing the formation of condensation. Note: A minimum of two vents is required to vent any individual roof area.

OPTIONS:T-8 bitumen protection.

RECOMMENDED USE:Suitable for all flat/low slope roofs for venting of plenum spaces. Primarily designed for built up roofing (BUR) and modified bitumen roofing, or single ply roofs providing the deck flange has been treated for proper weld with the single ply. e.g. PVC coated deck flange for PVC membrane or contact cement coated deck flange for EPDM membrane. Consult Thaler representative for other single plys. See Thaler GAV-2 Gravity Air Vents for larger capacity vents.



SPECIFICATION (SHORT FORM):Gravity air vents: Thaler [GAV-1A] [GAV-1C][GAV-1SS] standard 12" (305 mm) high, [12" (305 mm)][20" (508 mm)] diameter gravity air vent consisting of [.064" (1.6 mm) mill finish 1100-0T alloy aluminum] [.032 (0.831 mm) 24 oz. copper] [.031" (0.79 mm) 22 ga. Type 304 stainless steel] with integral deck flange, removable conical hood fitted with three support brackets, and insect screen. [T-8 bitumen protection sleeve] [bituminous painted deck flange][PVC coated deck flange][plain deck flange]; manufactured by Thaler Metal Industries, 1-800-387-7217 (Mississauga, Ontario, Canada) or 1-800-576-1200 (New Braunfels, TX), installed as per manufacturer's written instructions. Provide 20 year warranty against defects in materials and/or manufacture.




Single Ply: Set vent deck flange in layer of membrane adhesive and extend single ply up vent sleeve to highest elevation possible and clamp membrane to sleeve. Note: for PVC membrane, specify PVC coated deck flange by adding suffix P to end of model number e.g. GAV-1A-P ; weld roofing to deck flange using PVC torch. Note: for EPDM, coat deck flange on site with contact cement before torching membrane to deck flange.


Ordering and Availability: Specify flashing material required by adding appropriate suffix to model number e.g. GAV-1A, for aluminum, etc. Available throughout North America. Contact Thaler for list of distributors and current cost information. Most products are readily available from stock.

GAV-2A, GAV-2C, GAV-2SS GRAVITY AIR VENTS (Large Size Vents)PATENTED



PLANUM OR CEILING AREA

WHEN ORDERING, STATE INSIDE DIAMETER (ID) OF VENT PIPE

AVAILABLE DIAMETERS

3" (75 mm) 4" (102 mm) 5" (127 mm) 6" (152 mm) 7" (178 mm) 8" (203 mm) 9" (229 mm)10" (254 mm)

4(102 mm)

A

MOISTURE STOPPER

INSECT SCREEN

8"(203 mm)

12" (305 mm)

?

STAINLESS STEEL WOOD SCREWS AT 6" (152 mm) CC + -

SPECIFY SLOPE (ROOF PITCH)WHEN ORDERING

?

?


STAINLESS STEEL SCREWSAND NUTSA

3" (75 mm)

SLEEVE WITH INTEGRAL DECK FLANGE 0.064" (1.6 mm) ALUMINUM, 24 oz. 0.032" (0.831 mm) COPPER OR 22 ga. (0.79 mm) STAINLESS STEEL.

REMOVABLE CONICAL HOOD (FOR CLEANING) FITTED WITH THREE SUPPORT BRACKETS.0.064" (1.6 mm) ALUMINUM, 24 oz. 0.032" (0.831 mm) COPPER OR 22 ga. 0.031" (0.79 mm) STAINLESS STEEL.

See reverse side of page for GravityAir Vents number calculation

ROOF SPECIALTIESGAV-3A/-GAV-3C/GAV-3SSGRAVITY AIR VENTS (Small Size Vents-Slope Roofs)

DESCRIPTION:Thaler GAV-3 Gravity Air Vents for sloped roofs consist of a metal sleeve with integral deck flange, removable conical hood fitted to sleeve with a three support brackets, and insect screen. Available in aluminum (GAV-3A), copper (GAV-3C), or stainless steel GAV-3SS).


NBC (NATIONAL BUILDING CODE) REQUIREMENT: Vents in slope roofs 1 in 6 or greater shell be distributed so that approximately 50 per cent of the required vent area is located near the lower part of the roof and approximately 50 per cent of the required vent area is near the ridge.

SPACING:For any given roof, Thaler recommends a minimum 3" (76 mm) vent be located at each corner of the roof and a minimum of one vent in the middle of the roof. Venting efficiency is directly proportional to the number of vents employed e.g. 4 vents, each with 36 sq. in. (26 cm2) on a 300 sq. ft. (28 m2) roof is preferable to using 2 vents, each with a 72 sq. in. (54 cm2) of free venting area. Increasing the number of vents allows air to be drawn from the corners of the roof area thereby increasing overall venting efficiency while preventing the formation of condensation. Note: A minimum of two vents is required to vent any individual roof area.

PROMINENT FEATURES:Urethane insulated liner prevents formation of condensation. Note: without insulation, condensate freezing in winter can thaw in spring and show up as leaks in ceiling. Also, in wintertime, moisture-laden warm air rising in the vent freezes on the underside of the hood rather than in the lower part of the vent and runs down the slope of the hood and out the vent holes to the exterior during periods of thaw.

RECOMMENDED USE:Suitable for all slope roofs for venting of plenum spaces. Primarily designed for built up roofing (BUR) and modified bitumen roofing, or single ply roofs providing the deck flange has been treated for proper weld with the single ply. e.g. PVC coated deck flange for PVC membrane or contact cement coated deck flange for EPDM membrane. Consult Thaler representative for other single plys. See Thaler GAV-4 Gravity Air Vents for larger capacity vents.


MAINTENANCENo maintenance required (maintenance free).

SPECIFICATION (SHORT FORM):Gravity air vents: Thaler [GAV-3A] [GAV-3C][GAV-3SS] standard 12" (305 mm) high, [3" (76 mm)][4" (102 mm)] diameter gravity air vent consisting of [.064" (1.6 mm) mill finish 1100-0T alloy aluminum] [ .032 (0.831 mm) 24 oz. copper] [.031" (0.79 mm) 22 ga. Type 304 stainless steel] with integral deck flange, removable conical hood fitted to sleeve with three support brackets, insect screen and [bituminous painted deck flange][PVC coated deck flange] [plain deck flange]; manufactured by Thaler Metal Industries, 1-800-387-7217 (Mississauga, Ontario, Canada) or 1-800-576-1200 (New Braunfels, TX), installed as per manufacturer's written instructions. Provide 20 year warranty against defects in materials and/or manufacture.







GAV-3A, GAV-3C, GAV-3SS GRAVITY AIR VENTS (Small Size Vents For Sloped Roofs)



SIDE VIEWS

TOP VIEW

63.62 (410 cm2)9" (229 mm)78.54 (507 cm2)



For example: Four vents each with 36 square inches (232 cm2) of free venting area on a 300 square foot (28 m2) roof is preferable to using two vents, each with 72 square inches (464 cm2) of free venting area. Increasing the number of vents, while maintain the required total amount of free venting area by decreasing the size of the individual vents allows air to drawn from the corners of the roof, thereby increasing overall venting efficiency, and avoiding condensation formation.

10" (254 mm)

FREE VENTING AREA(SQURE INCHES)

50.27 (324 cm2)38.48 (248 cm2)28.27 (182 cm2)19.63 (127 cm2)12.6 (81 cm2)7.07 (46 cm2)

INSIDE DIAMETER (ID) VENT

8" (203 mm)7" (178 mm)

6" (152 mm)5" (127 mm)4" (102 mm)3" (76 mm)

H-3ACANADA: 1.800.387.7217 U.S.: 1.800.576.1200 WEB: www.thalermetal.com EMAIL: [email protected]

H-3A

PLENUM OR CEILING AREA

INSECT SCREEN

A

4(102 mm)

MOISTURE STOPPER

DB

SLEEVE WITH INTEGRAL DECK FLANGE 0.064" (1.6 mm) ALUMINUM, 24 oz. 0.032" (0.831 mm) COPPER OR22 ga. 0.031" (0.79 mm) STAINLESS STEEL.

C

?

STAINLESS STEEL WOOD SCREWS AT 6" CC + -

SPECIFY SLOPE (ROOF PITCH) WHEN ORDERING

8"(203 mm)

?

?

D(165 mm)6"-1/2"

(178 mm)7"

(191 mm)7-1/2"

(203 mm)8"

(222 mm)8-3.4"

REMOVABLE CONICAL HOOD (FOR CLEANING) FITTED WITH THREE SUPPORT BRACKETS.0.064" (1.6 mm) ALUMINUM, 24 oz. 0.032" (0.831 mm) COPPEROR 22 ga 0.031" (0.799 mm) STAINLESS STEEL.STAINLESS STEEL SCREW

STAINLESS STEEL NUTS AND SCREWS

(457mm) (660 mm) (356 mm)

(762 mm)30"

(508mm) 20"DIA.

(467mm)18"

B(508 mm)

20"

(559 mm)

(609 mm)24"

26"

22"

A(305mm) 12"DIA.

(356mm)14"DIA.

(406mm) 16"DIA.

18"DIA.

C(356 mm)

14"

14"(356 mm)

15"(381 mm)

16"1641 (cm²)314.160 SQ.IN2026 (cm²)

113.098 SQ.IN

153.938 SQ.IN

201.062 SQ.IN

254.470 SQ.IN

Area Sq.Inches

730 (cm²)

993 (cm²)

1297 (cm²)

See reverse side of page for GravityAir Vents number calculation

ROOF SPECIALTIESGAV-4A/-GAV-4C/GAV-4SSGRAVITY AIR VENTS (Large Size Vents-Slope Roofs)

DESCRIPTION:Thaler GAV-4 Gravity Air Vents for sloped roofs consist of a metal sleeve with integral deck flange, removable conical hood fitted to sleeve with a three support brackets, and insect screen. Available in aluminum (GAV-3A), copper (GAV-3C), or stainless steel (GAV-3SS).


NBC (NATIONAL BUILDING CODE) REQUIREMENT:Vents in slope roofs 1 in 6 or greater shell be distributed so that approximately 50 per cent of the required vent area is located near the lower part of the roof and approximately 50 per cent of the required vent area is near the ridge.

SPACING: For any given roof, Thaler recommends a minimum 3" (76 mm) vent be located at each corner of the roof and a minimum of one vent in the middle of the roof. Venting efficiency is directly proportional to the number of vents employed e.g. 4 vents, each with 36 sq. in. (26 cm2) on a 300 sq. ft. (28 m2) roof is preferable to using 2 vents, each with a 72 sq. in. (54 cm2) of free venting area. Increasing the number of vents allows air to be drawn from the corners of the roof area thereby increasing overall venting efficiency while preventing the formation of condensation. Note: A minimum of two vents is required to vent any individual roof area.

RECOMMENDED USE:Suitable for all slope roofs for venting of plenum spaces. Primarily designed for built up roofing (BUR) and modified bitumen roofing, or single ply roofs providing the deck flange has been treated for proper weld with the single ply. e.g. PVC coated deck flange for PVC membrane or contact cement coated deck flange for EPDM membrane. Consult Thaler representative for other single plys. See Thaler GAV-4 Gravity Air Vents for larger capacity vents.



SPECIFICATION (SHORT FORM):Gravity air vents: Thaler [GAV-4A] [GAV-4C][GAV-4SS] [C high], [12" (305 mm)][14" (356 mm)] diameter gravity air vent consisting of [.064" (1.6 mm) mill finish 1100-0T alloy aluminum] [ .021 (0.53 mm) 16 oz. copper] [.018" (0.46 mm) Type 304 stainless steel] with integral deck flange, removable conical hood fitted to sleeve with three support brackets, insect screen and [bituminous painted deck flange][PVC coated deck flange] [plain deck flange]; manufactured by Thaler Metal Industries, 1-800-387-7217 (Mississauga, Ontario, Canada) or 1-800-576-1200 (Niagara Falls, NY), installed as per manufacturer's written instructions. Provide 20 year warranty against defects in materials and/or manufacture.







GAV-4A, GAV-4C, GAV-4SS GRAVITY AIR VENTS (Large Size Vents For Sloped Roofs)





For example: Four vents each with 36 square inches (232 cm2) of free venting area on a 300 square foot (28 m2) roof is preferable to using two vents, each with 72 square inches (464 cm2) of free venting area. Increasing the number of vents, while maintain the required total amount of free venting area by decreasing the size of the individual vents allows air to drawn from the corners of the roof, thereby increasing overall venting efficiency, and avoiding condensation formation.

SIDE VIEWS

TOP VIEW

H-4A


ROOF SPECIALTIESGRAVITY VENTSSPECIFICATION



PART 1: GENERAL

1.01 SECTION INCLUDES

A. Supply and installation of roof accessories, including: 1. Gravity air vents.

1.02 RELATED SECTIONS

A. Section 06100 - Rough Carpentry

B. Section 07200 - Thermal Protection C. Section 07500 - Membrane Roofing

D. Section 07900 - Joint Sealers

1.03 REFERENCES

[A. CRCA (Canadian Roofing Contractor’s Association)]

[B. NRCA (National Roofing Contractor’s Association)]

[C. SPRI (Single Ply Roofing Institute)] [D. CUFCA (Canadian Urethane Foam Contractor’s Association) and CGSB-51-GP 46MP Manual for "Installers of Spray Polyurethane Foam Thermal Insulation" and ASTM C1029-90 "Spray Applied Rigid Cellular Polyurethane Thermal Insulation"]

1.04 SUBMITTALS

A. Manufacturer’s descriptive literature for each product, including section or other type details. B. Manufacturer’s written installation instructions.

C. Shop drawings and samples, when required, in accordance with Section [01300].

1.05 QUALITY ASSURANCE

A. Roof accessories manufactures to have minimum 5 years documented experience in the design and fabrication of roofing specialities and accessories.

1.06 SPECIAL WARRANTY

A. Warrant products installed under this section of work to be free of defects in materials and/or manufacture [and condensation] for a period of 20 years when installed in accordance with the manufacturer's written instructions.

Note: This gravity air vent specification, with minor editing, has been written as a separate section of work. Alternatively, the appropriate clauses may be incorporated as part roofing specification.

H-5




PART 2: PRODUCTS

2.01 MANUFACTURER

A. Provide products as manufactured by Thaler Metal Industries, 1-800-387-7217 (Mississauga, Ontario, Canada) or 1-800-576-1200 (New Braunfels, TX) or provide equal products by another manufacturer approved in advance by the [Architect], based upon: 1. 20 year warranty against defects in materials and/or manufacture, as applicable; 2. maintenance free design; 3. materials and sizes options, and thicknesses; 4. injection molded urethane insulation to CGSB-51-GP 46MP and ASTM C1029-90, as applicable; 5. treated deck flange, as applicable; 6. written installation instructions.

2.02 MANUFACTURED UNITS

GAV-1 Gravity Air Vents-Small Size Vents A. Gravity air vents: Thaler [GAV-1A] [GAV-1C][GAV-1SS] standard 12" (305 mm) high, [3" to 10” (76 mm) to (245 mm)] diameter gravity air vent consisting of [.064" (1.6 mm) mill finish 1100-0T alloy aluminum] [24 oz. (0.831mm) copper] [.031" 22 ga. Type 304 stainless steel] with integral deck flange, removable conical hood fitted with three support brackets, insect screen and [bituminous painted deck flange][PVC coated deck flange][plain deck flange].

GAV-2 Gravity Air Vents (Large Size Vents) B. Gravity air vents: Thaler [GAV-2A] [GAV-2C][GAV-2SS] standard 12” (305 mm) high [12" (305 mm) and up] diameter gravity air vent consisting of [.064" (1.6 mm) mill finish 1100-0T alloy aluminum] [24 oz. (0.831 mm) copper] [.031" (0.79 mm) 22 ga. Type 304 stainless steel] with integral deck flange, fixed conical hood fitted with insect screen and support brackets, and [bituminous painted deck flange][PVC coated deck flange][plain deck flange]. GAV-3 Gravity Air Vents-Small Size Vents Sloped Roofs C. Gravity air vents: Thaler [GAV-3A] [GAV-3C][GAV-SS3] standard 12" and up (305 mm) high, [3" (76 mm)] to 10” (254 mm) diameter gravity air vent consisting of [.064" (1.6 mm) mill finish 1100-0T alloy aluminum] [24 oz. 0.032” (0.831 mm) copper] [.031" (0.79 mm) 22 ga. Type 304 stainless steel with integral deck flange, removable conical hood fitted with three support brackets, insect screen and [bituminous painted deck flange][PVC coated deck flange][plain deck flange].

GAV-4 Gravity Air Vents (Large Size Vents) Sloped Roofs D. Gravity air vents: Thaler [GAV-4A] [GAV-4C][GAV-4SS] [_______] high, [12" (305 mm) and up] diameter gravity air vent consisting of [.064" (1.6 mm) mill finish 1100-0T alloy aluminum] [24 oz. 0.032” (0.831 mm) copper] [.031" (0.79 mm) 22 ga.) Type 304 stainless steel] wit integral deck flange, fixed conical hood fitted with insect screen and support brackets, and [bituminous painted deck flange][PVC coated deck flange] [plain deck flange].

PART 3: EXECUTION

3.01 EXAMINATION

A. Report to the Contractor in writing, defects of work prepared by other trades and other unsatisfactory site conditions. Verify site dimensions. Commencement of work will imply acceptance of prepared work.

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3.02 INSTALLATION

A. Install flashing in accordance with manufacturer's printed instructions.

Note: Items B to F (regarding roof spaces) have been condensed from the 1995 National Building Code of Canada (NBC). Consult with authorities having jurisdiction for specific data. B. Vent roof space or attic above an insulated ceiling with openings to the exterior to provide unobstructed vent area of not less than 1/300 of the insulated ceiling area.

C. Uniformly distribute vents on opposite sides of the building.

D. Design vents to prevent entry of rain, snow and insects.

E. Determine unobstructed vent area required in conformance with CAN3-A93, "Natural Airflow Ventilators for Buildings".

F. For low slope roofs where insulation is placed below roof sheathing in roofs having a slope of less than 1 in 6 or in roofs that are constructed with roof joists, the unobstructed vent area shall be not less than 1/150 of the insulated ceiling area.

BUR G. Set flashing deck flange in layer of plastic cement and flash in with 3 overlapping layers of felt flashing.

Modified Bitumen H. Torch membrane until bitumen is fluid and set deck flange into fluid. Flash in flange with two overlapping layers of ModBit and seal with asphalt sealer.

Single Ply I. Set deck flange in layer of membrane adhesive and extend single ply up sleeve to highest elevation possible and clamp membrane to gravity air vent.

Note: For PVC membrane, specify PVC coated deck flange by adding suffix P to end of Thaler model number, e.g. GAV-1A-P; weld roofing to deck flange using PVC torch.

PVC Single Ply J. Set deck flange in layer of membrane adhesive and extend single ply up sleeve to highest elevation possible and clamp membrane to flashing. Weld roofing to deck flange using PVC torch.

3.03 FIELD QUALITY CONTROL

A. Comply with the requirements of Section [01400 - Quality Control]. 3.04 ADJUSTING

A. Verify that all manufactured units have been installed in accordance with specifications and details, and will function as intended. Adjust any items where necessary to ensure proper operation.

3.05 CLEANING

A. Clean manufactured units using materials and methods approved by manufacturer. Do not use cleanersor techniques which could impair performance of the roofing system.

End Of Section

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SECTION G GRAVITY VENTS - Thaler Metal · CALCULATING THE NUMBER OF GRAVITY AIR VENTS 144 Square...

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